html, body {
  margin:0;
  padding: 0;
  width: 100%;
  height: 100%;
}

body {
  background-image: url('../assets/bg2.jpg');
  background-size: cover;
  background-position: center;
  font: 14px 'Helvetica Neue','Microsoft Yahei';
  color: #4d4d4d;
  font-smoothing: antialiased;
  font-weight: 30 ;
}


.cover {
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
  background-color: #999;
  opacity: 0.1;

}
